Image forming apparatus including a heating unit
US7239821B2 · kind B2 · utility
30Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2005 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Jul 1, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/80
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Power is supplied from a capacitor of an auxiliary power source to a secondary heating element of a heating unit, thereby preventing temperature drop of a fixing roller at the time of continuous paper delivery. An allowable range for starting discharge from the capacitor is set to, for example, 30 to 40 volts. A discharge time in which the voltage of the capacitor reduces to a termination value, such as 20 volts, is longer than a time necessary for a reading unit to read a maximum number (for example, 100 sheets) of documents that can be read at one time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.